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here are many factors (variables) that could affect my investigation such as the temperature the yeast respires at as at different temperatures the enzymes in yeast work faster or slower at breaking down the glucose. The amount of yeast will also have an effect on the results, as if we are to use different amounts in each experiment it will form an unfair test. Another factor that could affect our investigation is the percentage of glucose in the yeast. ...
I have chosen to investigate the affect the % concentration of glucose has on the rate of respiration in yeast. I will use an experiment to determine whether the yeast´s rate of respiration will be quicker, slower or if it does not change when the % concentration of glucose in it is varied.
I predict that the yeast´s respiratory rate of reaction should increase in speed as the % of glucose increases. ...
My reason for the above prediction is that yeast is a unicellular fungus, which feeds saprophytically and can respire both aerobically and anaerobically.
Approximate Word count = 784
Approximate Pages = 3.1
(250 words per page double spaced)
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